Laser vaporized CrOx/Al2O3 nanopowders as a catalyst for isobutane dehydrogenation

Anton I. Kostyukov, Mark G. Baronskiy, Tatyana V. Larina, Valeriy N. Snytnikov, Nadezhda A. Zaitseva, Alena A. Pochtar, Arcady V. Ishchenko, Svetlana V. Cherepanova, Valeriy N. Snytnikov

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1 Citation (Scopus)

Abstract

Laser vaporized xCr/Al2O3 nanopowders with the particle size of ca. 15 nm were studied by XRF, EDX, HRTEM, XRD, DD, BET, TGA, UV–Vis DRS, Raman and PL spectroscopy methods as a catalytic system in dehydrogenation of isobutane. The nanopowders were found to contain not only the Cr6+ ions located on the surface of nanoparticles, but also two different types of Cr3+ sites as components of the γ-Al2O3 solid solution. One type consists of the bulk Cr3+b sites in a strong crystal field. Another type is represented by the Cr3+s sites residing near the surface of xCr/Al2O3 nanoparticles. Such sites are in a weak crystal field. It was shown that catalytic activity of the nanostructured xCr/Al2O3 system is provided by the high content of surface Cr3+s sites. The results obtained make it possible to propose the nanopowders obtained by laser synthesis as a promising catalytic system that can be used in the development of highly active catalysts for dehydrogenation of alkanes with the decreased chromium content.

Original languageEnglish
Article number110664
Number of pages14
JournalMaterials Characterization
Volume169
DOIs
Publication statusPublished - Nov 2020

Keywords

  • CO-laser vaporization
  • Cr species
  • CrO/AlO catalysts
  • Isobutane dehydrogenation
  • Nanopowder
  • PHOTOLUMINESCENCE
  • RAMAN-SPECTROSCOPY
  • PROPANE
  • DIFFUSE-REFLECTANCE SPECTROSCOPY
  • ALUMINA
  • CrOx/Al2O3 catalysts
  • CHROMIUM-OXIDE CATALYSTS
  • NANOPARTICLES
  • REDUCTION
  • CO2-laser vaporization
  • Crn+ species
  • OPTICAL SPECTROSCOPY
  • AL2O3

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